Spring MVC中自定义拦截器的实例讲解

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
request.setAttribute("begin", System.currentTimeMillis());
return true;
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
 ModelAndView modelAndView) throws Exception {
long begin = (long)request.getAttribute("begin");
request.removeAttribute("begin");
long end = System.currentTimeMillis();
System.out.println("本次请求消耗时间为："+new Long(end-begin)+"ms");
}

xmlns:mvc="http://www.springframework.org/schema/mvc" 
xsi:schemaLocation=" http://www.springframework.org/schema/mvc 
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd"

<mvc:interceptors> 
<!-- 使用bean定义一个Interceptor，直接定义在mvc:interceptors根下面的Interceptor将拦截所有的请求 --> 
<bean class="org.aming.demo.springmvc.interceptor.LogInterceptor"/> 
<mvc:interceptor> 
 <mvc:mapping path="${指定的URL}"/> 
 <!-- 定义在mvc:interceptor下面的表示是对特定的请求才进行拦截的 --> 
 <bean class="${其他拦截器}"/> 
</mvc:interceptor> 
</mvc:interceptors> 

@Bean
public LogInterceptor logInterceptor() {
 return new LogInterceptor();
}

@Override
public void addInterceptors(InterceptorRegistry registry) {
 registry.addInterceptor(logInterceptor());
}